Decay resistance, extractive content, and water sorption capacity of Siberian larch (Larix sibirica Lebed.) heartwood timber
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Martti Venäläinen
, Anni M. Harju , Nasko Terziev , Tapio Laakso and Pekka Saranpää
Abstract
The aim of this study was to find chemical or physical properties of Siberian larch heartwood timber that correlate with the variation in decay resistance. Juvenile heartwood from 24-year-old grafts of 15 clones was exposed to three brown-rot fungi according to the standard in vitro decay test (European standard EN 113). The mass losses caused by the brown rot fungi Coniophora puteana, Poria placenta, and Gloeophyllum trabeum were 20%, 28% and 17% of the dry mass, respectively. The average mass loss over the three fungi had a strong negative correlation with the concentration of taxifolin (r=–0.673, P=0.006), as well as with the concentration of total phenolics determined by the Folin-Ciocalteu assay (r=–0.677, P=0.006). Thus, the concentration of flavonoids is a promising property for indirect measurement of the decay resistance of Siberian larch timber. The most abundant heartwood extractives, arabinogalactans, had a non-significant relationship with the decay resistance, but their concentration correlated positively with the capacity of the wood to adsorb water (r=0.736, P=0.002). The hygroscopic properties of the wood or the wood density were not associated with the decay resistance.
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Articles in the same Issue
- Morphological and chemical variations between juvenile wood, mature wood, and compression wood of loblolly pine (Pinus taeda L.)
- XPS in combination with mercurization – incorporation of mercury into different morphological parts of an unbleached softwood kraft pulp
- Comparison of different XPS methods for fiber surface analysis
- Antifungal diterpenes from the bark of Cryptomeria japonica D. Don
- Rapid analysis of transgenic trees using transmittance near-infrared spectroscopy (NIR)
- Calibration of NIR to assess lignin composition (H/G ratio) in maritime pine wood using analytical pyrolysis as the reference method
- Dissolution of fibre material in alkaline pre-treatment and refining of spruce CTMP
- Creating water-repellent effects on wood by treatment with silanes
- Rheology of latex films bonded to wood: influence of cross-linking
- Reinforcing potential of wood pulp-derived microfibres in a PVA matrix
- Diffusion of tritiated water into water-saturated wood particles
- Interrelationship between the severity of heat treatments and sieve fractions after impact ball milling: a mechanical test for quality control of thermally modified wood
- Machinability investigation of medium-density fibreboard
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